Revenue Recognition - Schedule of Company's Total Revenues by Category for each Reportable Segment (Detail) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Revenue Recognition [Line Items]
Total	$ 5,414.0	$ 4,729.9	$ 4,739.1
Building Materials Business
Revenue Recognition [Line Items]
Total	5,115.3	4,487.2	4,467.8
Operating Segments | Building Materials Business East Group
Revenue Recognition [Line Items]
Total	2,303.0	1,949.1	1,949.0
Operating Segments | Building Materials Business West Group
Revenue Recognition [Line Items]
Total	2,812.3	2,538.1	2,518.8
Operating Segments | Building Materials Business
Revenue Recognition [Line Items]
Total	5,115.3	4,487.2	4,467.8
Operating Segments | Magnesia Specialties
Revenue Recognition [Line Items]
Total	298.7	242.7	271.3
Products and Services
Revenue Recognition [Line Items]
Total	5,084.7	4,432.1	4,422.3
Products and Services | Building Materials Business
Revenue Recognition [Line Items]
Total	4,810.0	4,211.2	4,172.4
Products and Services | Operating Segments | Building Materials Business East Group
Revenue Recognition [Line Items]
Total	2,161.6	1,826.6	1,814.5
Products and Services | Operating Segments | Building Materials Business West Group
Revenue Recognition [Line Items]
Total	2,648.4	2,384.6	2,357.9
Products and Services | Operating Segments | Magnesia Specialties
Revenue Recognition [Line Items]
Total	274.7	220.9	249.9
Freight
Revenue Recognition [Line Items]
Total	329.3	297.8	316.8
Freight | Building Materials Business
Revenue Recognition [Line Items]
Total	305.3	276.0	295.4
Freight | Operating Segments | Building Materials Business East Group
Revenue Recognition [Line Items]
Total	141.4	122.5	134.5
Freight | Operating Segments | Building Materials Business West Group
Revenue Recognition [Line Items]
Total	163.9	153.5	160.9
Freight | Operating Segments | Building Materials Business
Revenue Recognition [Line Items]
Total	305.3	276.0	295.4
Freight | Operating Segments | Magnesia Specialties
Revenue Recognition [Line Items]
Total	$ 24.0	$ 21.8	$ 21.4